Mechanics | Relativity Answers

if a disc of radius 5m is such that its density varies from its centre proportional to the sqr of distance ..
density at deistance 1 is 2kg/msqr then determine its MI about an axis through centre and perpendicular the plane

A firefighter, 50.0 m away from a burning building, directs a stream of water from a ground level fire hose at an angle of 30.0° above the horizontal. If the speed of the stream as it leaves the hose is 40.0 m/s, at what height will the stream of water strike the building?

Player A is running at a velocity of 4 m/s. Player B starts from rest and accelerates at .75 m/s2. If they start from a position 25m apart, how long is it before they collide

You are on a treasure hunt and your map says "Walk due west for 57.1 paces, then walk 70.0 ° north of west for 71.3 paces, and finally walk due north for 64.6 paces." What is the magnitude of the component of your displacement in the direction (a) due north and (b) due west?

http://edugen.wileyplus.com/edugen/courses/crs3976/art/qb/qu/c01/w1502int.gif

Three forces are applied to an object, as shown in the figure. Force has a magnitude of 21.3 newtons (N) and is directed 30.0° to the left of the +y axis. Force has a magnitude of 12.0 N and points along the +x axis. A third force is applied such that the vector sum of the three forces is 0 N. What are (a) the magnitude and (b) direction of this third force ? Specify the direction as a positive angle relative to the negative x axis, as shown in the figure.

The route followed by a hiker consists of three displacement vectors , , and . Vector is along a measured trail and is 2950 m in a direction 42.0 ° north of east. Vector is not along a measured trail, but the hiker uses a compass and knows that the direction is 37.0 ° east of south. Similarly, the direction of vector is 39.0 ° north of west. The hiker ends up back where she started, so the resultant displacement is zero, or + + = 0. Find the magnitudes of (a) vector and (b) vector .

A ladder 9.00m long leans against the side of a building .If the ladder is inclined at an angle of 75.0 to the horizontal,what is the horizontal distance from the bottom of the ladder to the building?

A person whose mass is m = 70.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 12.9° with the horizontal. What is the reading on the scale?

from t=0 to t=5.00 min, a man stands still,and from t=5.00 min to t=10.0 min, he walks briskly in a straight line at a constant speed of 2.20 m/s. what are (a) his average velocity and (b) his average acceleration in the time interval 2.00 min to 8.00 min? what are (c) average velocity and (d) average acceleration in the time interval 3.00 min to 9.00 min? (e)sketch x versus t and v versus t, and indicate how the answers to (a) through (d) can be obtained from the graphs.

Three identical rigid circular cylinders A, B and C are arranged on smooth inclined surfaces as shown in figure. Find the least value of theta that prevent the arrangement from collapse.The link of the image is here- http://prntscr.com/1tfxk3